AD1987(Rev0) データシートの表示（PDF） - Analog Devices
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AD1987 Datasheet PDF : 18 Pages
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AD1987
HD–AUDIO LINK SPECIFICATION
HD-audio signals comply with the High Definition audio speci-
fications. Please refer to these specifications at:
http://www.intel.com/standards/hdaudio/
POWER DOWN STATES
Parameter
Function Node in D0, All Nodes Active
Function Node in D31
Codec in RESET
Individual Block Power Savings
DAC Pair Powered Down Saves (Each)
ADC Pair Powered Down Saves (Each)
Mixer Power Control (And Associated Amps) Saves
MIC_BIAS Powered Down Saves2, 3
IDVDD Typ
66
21
3
IAVDD Typ
41
1.2
3
Unit
mA
mA
mA
6
5
mA
5.3
3.2
mA
0
2
mA
0
0.5
mA
1 Function node D3 state powers down all nodes except for the VREF, Mixer and MIC_BIAS nodes which have independent power controls. VREF should be kept active when
background functions such as jack presence detection or analog pass-through are required. Mixer should be kept active when analog pass-through is required. MIC_BIAS
can be disabled if microphones are not in use in the power-down state.
2 Powering down the MIC_BIAS powers down all port MIC_BIAS pins. This disables all microphone bias circuits set to 100% or 50%, setting them to the Hi-Z state. The
0 Ω and Hi-Z states remain unaffected by the MIC_BIAS power state.
3 Test conditions: 30 pF load, 2.0 MHz frequency, 3.3 V AVDD.
Rev. 0 | Page 7 of 18 | May 2007
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